Near Surface Geophysics
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Electrical properties of clay in relation to moisture loss
Near Surface Geophysics - Tập 8 Số 2 - Trang 173-180 - 2010
ABSTRACTSubsidence of buildings situated on clay soils can be a serious
insurance problem in dry summers. In order to investigate subsidence and monitor
its progress, non‐invasive techniques that provide information on soil
properties have enormous potential. To help assess the application of new
electrical tomographic monitoring techniques, the electrical properties of seven
geographically extens...
Properties and effects of measurement errors on 2D resistivity imaging surveying
Near Surface Geophysics - Tập 1 Số 3 - Trang 105-117 - 2003
ABSTRACTElectrode spacing errors and errors correlated with the magnitude of the
observed potential are two key factors that affect the data quality for DC
resistivity imaging measurements. This paper investigates the properties and
effects of these two kinds of error on 2D resistivity imaging or inversion for
practical applications. By analytic analysis and numerical simulations, the
off‐line and...
Spectral Induced Polarization (SIP) signatures of clayey soils containing toluene
Near Surface Geophysics - Tập 10 Số 6 - Trang 503-515 - 2012
ABSTRACTWe performed laboratory experiments to investigate the sensitivity of
the Spectral Induced Polarization (SIP) method to toluene contamination in
clayey soils. We used mixtures of quartzitic sand and montmorillonite as soil
samples, artificially contaminated with varying amounts of toluene. Care was
taken to quantify the experimental uncertainty resulting from packing since such
effects mus...
Coupling hydrogeophysics with hydrodynamic modelling to infer subsurface hydraulic architecture of an alluvial floodplain
Near Surface Geophysics - Tập 19 Số 3 - Trang 335-352 - 2021
ABSTRACTThis paper underscores the importance of spatially dense geophysical
data sets for making informed decisions in water management strategies. Such
decisions may require understanding how site‐specific subsurface architecture –
especially hydraulic connectivity – impacts the response of a shallow aquifer to
anthropogenic hydrologic disturbances (e.g. over‐pumping of a shallow aquifer).
At a ...
S‐wave velocity structure of Chlef City, Algeria, by inversion of Rayleigh wave ellipticity
Near Surface Geophysics - Tập 16 Số 3 - Trang 328-339 - 2018
ABSTRACTChlef City, Algeria, which is located in the Lower Cheliff Basin, is
vulnerable to seismic hazards. Since there is no constrained velocity model for
the Lower Cheliff Basin, particularly at greater depths, we conducted an ambient
vibration investigation to map the shear‐wave velocity structure beneath the
city, with the primary goal of supplementing the existing microzonation studies.
Here...
Combination of 1D laterally constrained inversion and 2D smooth inversion of resistivity data with a priori data from boreholes
Near Surface Geophysics - Tập 3 Số 2 - Trang 71-79 - 2005
ABSTRACTResistivity imaging in combination with borehole information is a
powerful tool for site investigation. We show that the combination of 1D
laterally constrained inversion (1D‐LCI) with the use of a priori information
from borehole data and 2D smooth inversion adds significant value to the
interpretation of continuous vertical electrical sounding (CVES) data. The
1D‐LCI offers an analysis o...
Weathering variations in a granitic massif and related geotechnical properties through seismic and electrical resistivity methods
Near Surface Geophysics - Tập 8 Số 6 - Trang 585-599 - 2010
ABSTRACTMapping and distribution with depth of alteration in rocks is critical
in engineering planning because it has a fundamental impact on the geotechnical
properties of the materials. Lateral heterogeneity on a weathered rock massif
makes boreholes inadequate for its complete characterization. Geophysical
methods increase spatial sampling along the study area and can be related to
geotechnical...
Effective medium theories for modelling the relationships between electromagnetic properties and hydrological variables in geomaterials: a review
Near Surface Geophysics - Tập 7 Số 5-6 - Trang 563-578 - 2009
ABSTRACTThe paper reviews the effective medium theories used for modelling the
relationships between electromagnetic properties (low‐frequency conductivity and
high‐frequency permittivity) and hydrological variables (water content,
salinity, suction, permeability) in soils and rocks. It aims a) to provide a
simple presentation of these theoretical approaches, b) to present their
theoretical and pr...
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